path: root/libbb/bb_pwd.c (plain)
blob: d5e651cc8a64cc99cfe6fee96fb8a090325c9620

1	/* vi: set sw=4 ts=4: */
2	/*
3	* password utility routines.
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	* Copyright (C) 2008 by Tito Ragusa <farmatito@tiscali.it>
7	*
8	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
9	*/
10
11	#include "libbb.h"
12
13	/* TODO: maybe change API to return malloced data?
14	* This will allow to stop using libc functions returning
15	* pointers to static data (getpwuid)
16	*/
17
18	struct passwd* FAST_FUNC safegetpwnam(const char *name)
19	{
20	struct passwd *pw = getpwnam(name);
21	#ifdef __BIONIC__
22	if (pw && !pw->pw_passwd) {
23	pw->pw_passwd = "";
24	}
25	#endif
26	return pw;
27	}
28
29	struct passwd* FAST_FUNC safegetpwuid(uid_t uid)
30	{
31	struct passwd *pw = getpwuid(uid);
32	#ifdef __BIONIC__
33	if (pw && !pw->pw_passwd) {
34	pw->pw_passwd = "";
35	}
36	#endif
37	return pw;
38	}
39
40	struct passwd* FAST_FUNC xgetpwnam(const char *name)
41	{
42	struct passwd *pw = safegetpwnam(name);
43	if (!pw)
44	bb_error_msg_and_die("unknown user %s", name);
45	return pw;
46	}
47
48	struct group* FAST_FUNC xgetgrnam(const char *name)
49	{
50	struct group *gr = getgrnam(name);
51	if (!gr)
52	bb_error_msg_and_die("unknown group %s", name);
53	return gr;
54	}
55
56	struct passwd* FAST_FUNC xgetpwuid(uid_t uid)
57	{
58	struct passwd *pw = safegetpwuid(uid);
59	if (!pw)
60	bb_error_msg_and_die("unknown uid %u", (unsigned)uid);
61	return pw;
62	}
63
64	struct group* FAST_FUNC xgetgrgid(gid_t gid)
65	{
66	struct group *gr = getgrgid(gid);
67	if (!gr)
68	bb_error_msg_and_die("unknown gid %u", (unsigned)gid);
69	return gr;
70	}
71
72	char* FAST_FUNC xuid2uname(uid_t uid)
73	{
74	struct passwd *pw = xgetpwuid(uid);
75	return pw->pw_name;
76	}
77
78	char* FAST_FUNC xgid2group(gid_t gid)
79	{
80	struct group *gr = xgetgrgid(gid);
81	return gr->gr_name;
82	}
83
84	char* FAST_FUNC uid2uname(uid_t uid)
85	{
86	struct passwd *pw = getpwuid(uid);
87	return (pw) ? pw->pw_name : NULL;
88	}
89
90	char* FAST_FUNC gid2group(gid_t gid)
91	{
92	struct group *gr = getgrgid(gid);
93	return (gr) ? gr->gr_name : NULL;
94	}
95
96	char* FAST_FUNC uid2uname_utoa(uid_t uid)
97	{
98	char *name = uid2uname(uid);
99	return (name) ? name : utoa(uid);
100	}
101
102	char* FAST_FUNC gid2group_utoa(gid_t gid)
103	{
104	char *name = gid2group(gid);
105	return (name) ? name : utoa(gid);
106	}
107
108	long FAST_FUNC xuname2uid(const char *name)
109	{
110	struct passwd *myuser;
111
112	myuser = xgetpwnam(name);
113	return myuser->pw_uid;
114	}
115
116	long FAST_FUNC xgroup2gid(const char *name)
117	{
118	struct group *mygroup;
119
120	mygroup = xgetgrnam(name);
121	return mygroup->gr_gid;
122	}
123
124	unsigned long FAST_FUNC get_ug_id(const char *s,
125	long FAST_FUNC (*xname2id)(const char *))
126	{
127	unsigned long r;
128
129	r = bb_strtoul(s, NULL, 10);
130	if (errno)
131	return xname2id(s);
132	return r;
133	}
134
135	/* Experimental "mallocing" API.
136	* The goal is nice: "we want to support a case when "guests" group is very large"
137	* but the code is butt-ugly.
138	*/
139	#if 0
140	static char *find_latest(char last, char *cp)
141	{
142	if (!cp)
143	return last;
144	cp += strlen(cp) + 1;
145	if (last < cp)
146	last = cp;
147	return last;
148	}
149
150	struct group* FAST_FUNC xmalloc_getgrnam(const char *name)
151	{
152	struct {
153	struct group gr;
154	// May still be not enough!
155	char buf[64*1024 - sizeof(struct group) - 16];
156	} *s;
157	struct group *grp;
158	int r;
159	char *last;
160	char **gr_mem;
161
162	s = xmalloc(sizeof(*s));
163	r = getgrnam_r(name, &s->gr, s->buf, sizeof(s->buf), &grp);
164	if (!grp) {
165	free(s);
166	return grp;
167	}
168	last = find_latest(s->buf, grp->gr_name);
169	last = find_latest(last, grp->gr_passwd);
170	gr_mem = grp->gr_mem;
171	while (*gr_mem)
172	last = find_latest(last, *gr_mem++);
173	gr_mem++; /* points past NULL */
174	if (last < (char*)gr_mem)
175	last = (char*)gr_mem;
176	//FIXME: what if we get not only truncated, but also moved here?
177	// grp->gr_name pointer and friends are invalid now!!!
178	s = xrealloc(s, last - (char*)s);
179	return grp;
180	}
181	#endif
182